import java.util.*;

public class DuoTai {
    public static void main(String[] args){
        Map<String,String> map=new HashMap<String,String>();
        map.put("1","value1");
        map.put("2","value2");
        map.put("3","value3");

        System.out.println("通过Map.Keyset遍历key和value：");
        for (String key:map.keySet()){
            System.out.println("key="+key+" and value="+map.get(key));
        }

        System.out.println("通过Map.entrySet使用iterator遍历key和value：");
        Iterator<Map.Entry<String,String>> it=map.entrySet().iterator();
        while (it.hasNext()){
            Map.Entry<String,String> entry=it.next();
            System.out.println("key="+entry.getKey()+" value="+entry.getValue());
        }

        System.out.println("通过Map.entrySet遍历key和value");
        for (Map.Entry<String ,String> entry:map.entrySet()) {
            System.out.println("key=" + entry.getKey() + " and value=" + entry.getValue());
        }

    }
}